GASTROCOPTA, EAST INDIES, POLYNESIA. 141 



nesians. Its original habitat may have been somewhere be- 

 tween the Philippines and New Caledonia. The Pupillid 

 fauna of the islands between these extremes is but little 

 known as yet. 



There is some evidence that G. lyonsiana and pediculus in 

 the Hawaiian group are immigrants since the period of human 

 occupation. Neither has been found in the Pleistocene de- 

 posits, where native Pupillidas are abundant. This is nega- 

 tive evidence; yet since the Gastrocoptas inhabit the lower 

 levels, are generally spread in Oahu, and are often so abun- 

 dant that one can collect hundreds in a few minutes, their 

 absence from such deposits as that at Diamond Head and the 

 sands at Kahuku becomes significant. The Hawaiian species 

 both resemble Philippine forms closely, but the local race of 

 pediculus can also be matched exactly by individuals from 

 many Polynesian islands. 



Leucochilus euryomphalum Moellendorff (Abhandlungen 

 Naturforsch. Ges. Gorlitz, xxii, 1898, p. 153) from Tangat, 

 Busuanga, has not been described so far as I know. 



Pupa pfeifferi Boettger, stated to be from Pitcairn Island, 

 on the authority of Cuming, is not a Polynesian shell, in my 

 opinion, being identical with Gastrocopta munita- (Reibisch), 

 of the Galapagos Islands. See p. 96. 



86. GASTROCOPTA LYONSIANA (Ancey). PL 24, figs. 1 to 4. 



Shell dextral, glossy, obliquely striatulate under a strong 

 lens, oblong, subcylindric, obliquely rimate-perf orate, thin, 

 bright corneous. Spire more or less slender, subcyliudric, 

 tapering at the obtuse summit; whorls 5 to S 1 /^, convex, reg- 

 ularly increasing ; suture impressed, the last whorl somewhat 

 tapering, hardly constricted. Aperture truncate-oval, lamel- 

 late as follows : one parietal arising at the margin, but hardly 

 noticeable there, then suddenly becoming upright, strong and 

 slightly sinuous; one columellar lamella simple, appearing 

 like an acute tooth; two drop-shaped palatals, the first 

 smaller, second elongated, a little more remote from the mar- 

 gin. Peristome expanded, scarcely thickened, dilated at the 

 columellar margin. Length 2%, diam. 1 mm. (Ancey}. 



